#underDiv{
    display: flex;
    text-align: center;
    justify-content: center;
    align-items: center;
    position: absolute;
    bottom: 100px;
    box-sizing: border-box;
}
table{
    font-size:18px;
    font-weight: bold;
}
body{
    background-image: url("../../img/catBack7.webp");
    background-size:100%;
}
#addUserDiv{
    width: 700px;
}
#addDiv{
    background-color: skyblue;
    border: 1px solid #000;
    width: 500px;
    height: 300px;
    text-align: center;
    line-height: 50px;
    position: absolute;
    left: 100px;
    top: 100px;
    visibility: hidden;
}
#updateDiv{
    background-color: skyblue;
    border: 1px solid #000;
    width: 500px;
    height: 300px;
    text-align: center;
    line-height: 50px;
    position: absolute;
    left: 100px;
    top: 100px;
    visibility: hidden;
}